685994623 has 8 divisors (see below), whose sum is σ = 710067600. Its totient is φ = 661949568.

The previous prime is 685994611. The next prime is 685994627. The reversal of 685994623 is 326499586.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-685994623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685994627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51415 + ... + 63367.

It is an arithmetic number, because the mean of its divisors is an integer number (88758450).

Almost surely, 2^685994623 is an apocalyptic number.

685994623 is a deficient number, since it is larger than the sum of its proper divisors (24072977).

685994623 is a wasteful number, since it uses less digits than its factorization.

685994623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13961.

The product of its digits is 2799360, while the sum is 52.

The square root of 685994623 is about 26191.4990598095. The cubic root of 685994623 is about 881.9424306362.

The spelling of 685994623 in words is "six hundred eighty-five million, nine hundred ninety-four thousand, six hundred twenty-three".